I'm a lopper. No, I don't go around lopping people's heads off but I have been known to lop off parts of images. This is not intentional but it happens on occasion when I am rushing. And they are small lops: part of people's feet, top of someone's head, and tops or sides of structures that should be in the photo. Small or large, they ruin what I am trying to convey.
The photo below would have been a good one if the right shutter hadn't been lopped. The distance from the edge of the photo to the shutter should be equal on both sides. Sometimes you want an asymmetrical effect, but not in this case.

If you're a lopper like me, there are a couple of things you can do:
1. Slow down, take your time, take a deep breath, and concentrate.
2. Bracket. In college, my instructor told me to always take three photos using different F-stops and different angles. A similar directive applies to digital photos. Is everything you want in the photo? Is there anything you don't want in the photo that's too large to edit out later, such as a car or person?
Happy shooting and stop the lop!
What are you thoughts on this? Let me know: kmartta333@gmail.com